Assume that NAME is a VARCHAR(128) column, encoded in Unicode UTF-8, that
contains the value 'Jürgen'.
SELECT LEFT(NAME, 2), SUBSTR(NAME, 1, 2)
FROM T1
WHERE NAME = 'Jürgen'
Returns the value 'Jü' for LEFT and 'JÊ' for SUBSTR(NAME, 1, 2).

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